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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84fa0c2d391b34720c9d13991a4e2b4751d4b384cb98133fe27a10a26ab575a0' 
  AND token = 'QEem/XqgKR2uMx/T9JBHsL3s8OnDb9ovssEBxPy8kuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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