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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c24e6cb76164ff4ec474579f7c96b05bd447556a55838fa6b0371f16b80ecc09' 
  AND token = 'PiTp5r5l5bhKioQosr2z1kHFFGlHcbTjNxUsFh7IZjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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