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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d91c4ab53188e15e84510299728d33d4f2780723db53e0b29b589835511a18' 
  AND token = '04iZHbxb2clkFvWMyOOVttQT2TvogJhhX92Y2prCB+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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