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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ec97a2bbaab40257a555c53ed604629caebc7c9582bc72b2a236e57cec3a1fe' 
  AND token = 'hnSCuvw6yrm/t7cwZFw4BnrNfa1MKqUt4axW6v3NisQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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