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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0123722e01c8ed9b6d17f80f16828c65ce5facfe889d3cb62f15be4a566d4652' 
  AND token = 'zOy0g3ipE21083b37k82LcGVOtvSvS92yk2NhgVIKkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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