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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed463f503c6f2bec4fa5dc41e811e9f5bba1b319e7914b54f6941004a2cfd6e1' 
  AND token = 'Bmjuc9TUIEIZRI/IlqrXEEnpIA8ZK+ILvnHiMIJhOK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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