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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfeeb2fbd33d13778297f9272b7f4f9f05726714c6038fac54d4aa83f44e4dc' 
  AND token = '+rlno7RTinxa0s4umZr98ArFTAgOBRgZ2DEjebk93wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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