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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ef086c69cf93cd4e2d498d5bf6d6a6c9e862d51026a122b7d36545c10b51c2' 
  AND token = '/M+IygWuaR0/TygmAAXyBv/ra0+qg3IswDhpU7UD9CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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