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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14128fb2100c4ef4c813957e905bd94bb1f9cf5808fac45195a597824d1f3e3b' 
  AND token = 'K5kcZ1bD1sg0iG54S3MGsoKQPPYnIDlOPLICcPgXD1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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