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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab61fe386be47fe97aa2b8cbf003e40910da87108ceacc837cb39f0d61e89f9e' 
  AND token = '294o8E9ru84ojZcwXWVddt7L1GrQ2zE1oYyr3dPOjCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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