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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f5ecd806e07b11037a830a098f687e502891abcbab73ce21179cfba1c28ae6a' 
  AND token = 'OfGBqfn60iZ79n2PbD1D8k1zAli9X19QZq6d/wAMI+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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