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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c00f85d8c8625edcb3474085e0343202cd85eb3bf22c3b30dd53997d3ab13f70' 
  AND token = '/zW+xpPM+vEMLcVtVhaYAS9YKp05igq68WCPI/gQNK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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