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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c1645f1c83991797d1e29a22acb19b7860b0ac24e986a11ce827fca5e9461e' 
  AND token = 'E4xU79BGVschHNPg8b05HAG9kJYGDOJ7UU4WQDvb4Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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