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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a80158c605dbb4a0b07687e92f687fc7ca393ec6c0e52dee58fce9e4ba5b4193' 
  AND token = '1rft/wokf4/T1hm9tfFleP6w0kPiVdMNPMIKCoo5blk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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