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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3e0f0eef823621455d7c8ffc28ff561047b58c1f92f38d68fabc12ba2acc489' 
  AND token = 'eSCtB8wDe/Yq7GxbVU/BIOF7IQG4PabeO85gVlULql4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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