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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa6a1a394f4c5e530be0f7026e0a7d404cbf7ff816f362960aa99754239e6fb8' 
  AND token = 'nSdAwyZ7iXwcuSBU4wkZ5RTpNcE7uzgFOemYEiNBRIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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