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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a6571fe0a033edd9b4a670db87be629d4ac7d3fbc27ed503ae833b9b8d96f2a' 
  AND token = 'vAS1OrHfMHQHky5NFK9weRVPrJWU+UvjRmsJ5z4PmK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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