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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9223594fb8966ce23dc2970cd0abcfde1f1a56ab104f8c0986dcba52d7ec4e1' 
  AND token = '/gtxeTEYrca04Ujq/CZfWFkRfa7RgNXacPSUq52l8VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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