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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c066d85759b02b68bd4f2fa4dfdea3eb74726d2c27c784d68c2626e769dccac9' 
  AND token = '9b5+HHBGqG8rb1T05wMAET+dpl8dTlPDAfylaGhYBeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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