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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d16795f6c7f5d4a64b99ae9175b1bda6288a63ef109d982d95781549f6d3d7' 
  AND token = 'bJ5IKbzvYMznNV/VyB0IMpY+GdFd0dpAiqW1ab2md+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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