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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e8c3f83e925402d5a5126beb487cea696f3b23dcad76c91f6c149765bbf2e8e' 
  AND token = 'pd6T4O8k/rFhHPK7IHAAOrUpTdXR9lH2B1sdiR86ILQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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