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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '106a2b3d66fcfdc2e0a9d20aa57b650ff71a903b96a9633eceaa1e0395483b35' 
  AND token = 'jnSKKEri7dPkouE3p4tj9zGnTY5oU/LyMfrLMfr8QaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}