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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9630c127aec08b0136d7bd217560f005f6a13fad084cb704e7b4e30c83495a6' 
  AND token = 'Uxx2EwCuRcVdZde0o+l0BN+toT30a2j17GrEnY9lXnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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