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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84caa31a35778aadfc1fa4f7d8eb2d46b2a9a4a4028d2f0ea1cbff9d3e38af18' 
  AND token = '1VEWxuvGd8qb2oftv4pwvc3T5bwshJiBP+mnObvWOVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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