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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8430f4b957c51345acea892f989ff3c5d4c80a7b4364798de9a4c5503689fe96' 
  AND token = 'fci+vi6uqQtriiH+70MgVNra116CoRrTRNpMS+YUsMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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