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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0e8bf5d14fe98485522ebe78b89b9afb89f74e9ba5d4b0e36ba96e4ff06028a' 
  AND token = 'PEXjB1nqp7J1ny+fb0x0zlx3WlT+8FTEkgMEndq0qcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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