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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03bcae2d3697f3c4d4c01b66235f64ea0fe0210feb99540d0f09a3697ac19824' 
  AND token = '4uABnYPbXunVDP5dZhrvDwnM3I3mlebUYxpObF6yjHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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