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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb257ca2c91806bdf609be983339dc10d11aaff904e7e63f554360dcfc2a866' 
  AND token = 'm9VopctK6/X0PDGXbBCLgK6Eeb0IIqBU749NTLIxBh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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