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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eab0c8d8dda53a7f3443a66f458e6bbc9882581b85732d1e6e91f6dfda8823b' 
  AND token = '+eIS0vnVlEhLREQIexTc+ky42Zr+BfHxNZHJe7CHMrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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