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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd51bf2f7166084211b7f66311b0765c72290a86bc608f89061a5b772266db3f9' 
  AND token = 'Q5LbCeNHbQmyJhQsl78+jRzeaa0rHW1lvxkvn2hzQ+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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