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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93657d65ad486f938088ebdda79247f5225c941f7e166589fbcca1e3921e503' 
  AND token = 'T9jeplY1i8TL6HaA7BOwX+ctq+P9skz9XqwHFMy/9+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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