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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42ccb88fc50802199a30f98bd3edc6bb639dd4531fe74bba9609377cb209d01c' 
  AND token = 'gN2SgTNi9/XkMyQ1sInEaWZBGf+FhPbZFw6q27AXx1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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