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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc2d93e62d44f75c368ace183b7d13c89df4b874ac7249c7da5bfdebc13c6f5f' 
  AND token = 'CibZjJab+IBR1OTpjndp64tLQOBadbgky966jf6WY/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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