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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c1942e611cc5b39ce8fa0d7d166ce5aa25552e265770620932c8936a5519bb' 
  AND token = 'udwUOWhICCb5k+0ubtC4gLFwkBHY5XtofnWeLq0T1HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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