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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5312ca78907f059a7ac96e1e215a0fcd8c7f45091849fee2194a6557463763ff' 
  AND token = 'Q1DdwAJlru6+yGVNQqJ33GqGF7Zk01Nnr7u3JXdcYts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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