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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '081b0a933893e81a555ef5dac170ea573edaf7233c74f24ff47dc5379e77b06e' 
  AND token = 'PLFcuU6W8Fj1blqcVLUXKr89w6Lx/hxY5raS+vp80L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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