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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '505422aeabe4edb0c97fe41a8444233ac45fbf6ee2505ef04bca48761b7b0630' 
  AND token = '0fiyxqv4mmSsL6cla8vtBzXtnyIukVe5yOpGvcIFqK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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