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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec08d0ac6d5ddbb0f9836a9d5189b88ceaf982b15dcfdd7409706c7b5668c8f0' 
  AND token = 'wRbHr0S2EadynfHsuMOGUcePusAu0CMy7ZR2d40VPZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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