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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ec992d709418155af95d3eac1cb13632de6e8a83ef31a62c7a066770dd210b' 
  AND token = 'oc2lOa7jNu86nF3RkL46koH/baCW1679AbQqXPHyun0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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