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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a9147f23450768de6b27f5ee27c4b05d14fdc20817888b5a6096f6a674a3b6c' 
  AND token = 'NfRZ2mrtoUJMiTwv9U5l/HOfU2m8OtnoAP+lZwQeBQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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