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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74aa4b55392be52cf2e769240a3393b14a84bd6ad2dc4a01d8da8e1ffd782c5f' 
  AND token = 'NBD6gzke9TvAXGnuz6/XSyXHdJWsIPPhJ3VxH1U92D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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