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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c82311862e1bdb439f7cd32c47fd234e9aa344c77306be3fd6035e3e537821c' 
  AND token = 'PRgKK0YrPM4WnMixxhbTl4a9Dfzjho/BRl2Bh/AS+WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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