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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91662c3d3d23cc0fef131ef75e7414457899dec1cd5045f44339b584c0abcf98' 
  AND token = 'SI74Q3/prRGxO770J60AV2xuyJd2Bm0B+JfM6lV4Xjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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