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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c078e84472c01cbe82b8b2b24413f0d1d4c4ea11e4a2c5e80fb5507cade6208' 
  AND token = 'lYJuNUioUXMU3hD+kqZ8ntSIZWYFECLKfKNhUQcPItc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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