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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba18a5eaef77af7b761ae7b90a259d139bb1e225ccf7f7fc38e0c07aa9025fd' 
  AND token = 'mp2eQHz3Ox4+yM7eLf2VusNhD7/NsYAsZKVSefN3Ngs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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