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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10a1e62d1bb7ac3fb0af021019819546d888e023c8499b868c6e65c250ba9076' 
  AND token = 'Fa4RGjNOWmo4pe82bbhT9VZuGBuYFvvDlV9WlCWiQi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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